How can we help?

You can also find more resources in our Help Center.

20 terms

Astronomy 1

Astronomy
STUDY
PLAY
The faintest star visible to the naked eye has an apparent visual magnitude of about _______
+6
How long would it take to count all the stars in the Milky Way Galaxy at a rate of one star per second?
Several thousand years
Orion is visible on winter evenings but not summer evenings because of _________
The location of the earth in its orbit
Our Sun is a star of spectral type?
G
The Sun's rate of fusion is gradually increasing over time
True
The Sun is a relatively young star, near the beginning of its life
False
Which of the following statements is not true?
Atmosphere of Venus is very similar to that of Earth
A major discovery made by Shapley using RR Lyrae stars and globular clusters established
The size of the galaxy and the sun's position in it
Who discovered that Jupiter has moons?
Galileo
How long would it take to count all the stars in the Milky Way Galaxy at a rate of one star per second?
Several thousand years
What is the diameter of the disk of the Milky Way?
100,000 light years
Approximately how far is the Sun from the center of the galaxy?
28,000 light-years
Approximately how long does it take the Sun to orbit the Milky Way Galaxy?
230 million years
There are more large spiral galaxies than there are large elliptical galaxies
True
The total number of galaxies in the observable universe is estimated to be approximately
100 billion
The light radiated from the Sun's surface reaches Earth in about 8 minutes, but the energy of that light was released by fusion in the solar core about
a million years ago
The age of the universe is
Between 10 billion and 16 billion years
On the scale of the cosmic calendar, in which the history of the universe is compressed to 1 year, how long has human civilization (i.e., since ancient Egypt) existed?
A few seconds
What fraction of the mass needed to halt expansion is known to exist in the form of visible mass in the universe?
Less than 1 percent
Based on inventoried matter in the universe, including dark matter known to exist in galaxies and clusters, the actual density of the universe is what fraction of the critical density?
25 percent